Inclined or inclining from a horizontal direction; forming an angle with the plane of the horizon; slanting; aslant.n. An oblique direction; obliquity; slant; especially, a direction downward; as, a piece of timber having a slight slope.n. A declivity or acclivity; any ground whose surface forms an angle with the plane of the horizon.n. Specifically— In civil engineering, an inclined bank of earth on the sides of a cutting or an embankment. See grade, 2.n. In coal-mining, an inclined passage driven in the bed of coal and open to the surface: a term rarely if ever used in metal-mines, in which shafts that are not vertical are called inclines. See shaft and incline.n. In fort., the inclined surface of the interior, top, or exterior of a parapet or other portion of a work. See cut under parapet.n. In mathematics, the rate of change of a scalar function of a vector, relatively to that of the variable, in the direction in which this change is a maximum.